Helmet covers are usually made out of canvas or cotton and come in many camouflage designs, for example: woodland, desert or urban, and different camouflage patterns like MARPAT, CADPAT and ACUPAT. It can also be used for UN peacekeeping missions with a UN Blue colour helmet cover. White covers are sometimes used in snow regions. Helmet covers are generally a flat colour to stop any reflection from a metal helmet. Helmet covers are attached to the helmet in many different ways, such as a tight rubber lip which goes all the way around the helmet rim and is pulled on and peeled off, also there are versions with draw-strings and types which are attached to the helmet suspension system. The earliest helmet covers were retained simply by being "sandwiched" between the liner and the shell. Helmet covers help break up the helmet's distinctive silhouette and eliminate glare (especially if wet), plus muffles the sound of foliage striking or brushing the helmet.
In fact, at the beginning, the helmets on the soldiers' heads were covered with a layer of cloth, because the smooth-surfaced helmets could easily become a movable target under the sunlight, which was very unfavorable for combat and easy Because of this, the life was lost in vain, so the US military specially added a layer of net to the helmet.
This layer of net is also called "camouflage net", because when soldiers are fighting in desert areas or jungles, the smooth helmet is easy to expose the position, so adding a layer of net on the outside of the helmet can be very good. camouflage, just like a sniper's sniper gun and face must be painted with camouflage makeup to be able to hide in the grass perfectly.
In addition, the soldiers can also insert some branches or shrubs on the net, and paint this layer of net with camouflage makeup. This design can be said to be very considerate. Although the steel helmets of various countries in the world are not the same, they are all summed up through certain experiences and lessons, so the quality of modern steel helmets has been improved by leaps and bounds.

Helmet covers are used by most armies and are in the camouflage pattern of the country/military's camouflage pattern, but some armies do have different covers to the uniform, for example Austrian Bundesheer wear several different helmet covers instead of one standardized cover. The Israeli Defense Forces use a large, floppy helmet cover to break up the outline of the soldier. The US Army from 1953 to the mid-late 1980s used a dual-sided camouflage cover (one side a green leaf pattern, the other a brown and tan desert pattern) with its steel helmets while the rest of the uniform was green. The US Marine Corps adopted reversible camouflage helmet covers in late 1942. This led to the orders of "green-side out" or "brown-side out."

Another type of helmet cover is the mesh net cover, which also helps reduce the metal glare from combat helmets as well as giving an opportunity to add natural camouflage such as grass, leaves and twigs. This type of cover is however not as widely used anymore, as the modern camouflage cloth covers in various patterns are more common on modern combat helmets, and most cloth covers have cut-outs for placing foliage anyway. A common mistake is to attach too much or too long foliage which waves about when moving.